Re: [PATCH v2 4/9] tests/virtio-9p: added readdir test

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Donnerstag, 9. Januar 2020 00:55:45 CET Greg Kurz wrote:
> > diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
> > index 06263edb53..48c0eca292 100644
> > --- a/tests/virtio-9p-test.c
> > +++ b/tests/virtio-9p-test.c
> > @@ -68,6 +68,11 @@ static void v9fs_memread(P9Req *req, void *addr, size_t
> > len)> 
> >      req->r_off += len;
> >  
> >  }
> > 
> > +static void v9fs_uint8_read(P9Req *req, uint8_t *val)
> > +{
> > +    v9fs_memread(req, val, 1);
> > +}
> > +
> > 
> >  static void v9fs_uint16_write(P9Req *req, uint16_t val)
> >  {
> >  
> >      uint16_t le_val = cpu_to_le16(val);
> > 
> > @@ -101,6 +106,12 @@ static void v9fs_uint32_read(P9Req *req, uint32_t
> > *val)> 
> >      le32_to_cpus(val);
> >  
> >  }
> > 
> > +static void v9fs_uint64_read(P9Req *req, uint64_t *val)
> > +{
> > +    v9fs_memread(req, val, 8);
> > +    le64_to_cpus(val);
> > +}
> > +
> > 
> >  /* len[2] string[len] */
> >  static uint16_t v9fs_string_size(const char *string)
> >  {
> > 
> > @@ -191,6 +202,7 @@ static const char *rmessage_name(uint8_t id)
> > 
> >          id == P9_RLOPEN ? "RLOPEN" :
> >          id == P9_RWRITE ? "RWRITE" :
> > 
> >          id == P9_RFLUSH ? "RFLUSH" :
> > +        id == P9_RREADDIR ? "READDIR" :
> >          "<unknown>";
> >  
> >  }
> > 
> > @@ -348,6 +360,79 @@ static void v9fs_rwalk(P9Req *req, uint16_t *nwqid,
> > v9fs_qid **wqid)> 
> >      v9fs_req_free(req);
> >  
> >  }
> > 
> > +/* size[4] Treaddir tag[2] fid[4] offset[8] count[4] */
> > +static P9Req *v9fs_treaddir(QVirtio9P *v9p, uint32_t fid, uint64_t
> > offset,
> > +                            uint32_t count, uint16_t tag)
> > +{
> > +    P9Req *req;
> > +
> > +    req = v9fs_req_init(v9p, 4 + 8 + 4, P9_TREADDIR, tag);
> > +    v9fs_uint32_write(req, fid);
> > +    v9fs_uint64_write(req, offset);
> > +    v9fs_uint32_write(req, count);
> > +    v9fs_req_send(req);
> > +    return req;
> > +}
> > +
> > +struct v9fs_dirent {
> > +    v9fs_qid qid;
> > +    uint64_t offset;
> > +    uint8_t type;
> > +    char *name;
> > +    struct v9fs_dirent *next;
> > +};
> > +
> > +/* size[4] Rreaddir tag[2] count[4] data[count] */
> > +static void v9fs_rreaddir(P9Req *req, uint32_t *count, uint32_t
> > *nentries,
> > +                          struct v9fs_dirent **entries)
> > +{
> > +    uint32_t sz;
> 
> Even if this is a size indeed, the 9p spec uses the wording "count" and
> so does the function signature. Please rename this variable to local_count.
> Some other functions that return server originated data already use this
> naming scheme.

I know, I did that intentionally. But I don't care for such code style details 
enough to start argueing, so I'll change it.

> 
> > +    struct v9fs_dirent *e = NULL;
> > +    uint16_t slen;
> > +    uint32_t n = 0;
> > +
> > +    v9fs_req_recv(req, P9_RREADDIR);
> > +    v9fs_uint32_read(req, &sz);
> > +
> > +    if (count) {
> > +        *count = sz;
> > +    }
> > +
> > +    for (int32_t togo = (int32_t)sz;
> > +         togo >= 13 + 8 + 1 + 2;
> > +         togo -= 13 + 8 + 1 + 2 + slen, ++n)
> > +    {
> > +        if (!e) {
> > +            e = g_malloc(sizeof(struct v9fs_dirent));
> > +            if (entries)
> 
> ERROR: braces {} are necessary for all arms of this statement
> #98: FILE: tests/virtio-9p-test.c:407:
> +            if (entries)
> [...]

Right, sorry I missed that for some reason.

Best regards,
Christian Schoenebeck